ACCOUNTING FOR STRONG LOCALIZED HETEROGENEITIES AND LOCAL TRANSPORT EFFECT IN-CORE CALCULATION

Citation
Jm. Ruggieri et al., ACCOUNTING FOR STRONG LOCALIZED HETEROGENEITIES AND LOCAL TRANSPORT EFFECT IN-CORE CALCULATION, Nuclear science and engineering, 124(1), 1996, pp. 82-88
Citations number
8
Categorie Soggetti
Nuclear Sciences & Tecnology
ISSN journal
00295639
Volume
124
Issue
1
Year of publication
1996
Pages
82 - 88
Database
ISI
SICI code
0029-5639(1996)124:1<82:AFSLHA>2.0.ZU;2-W
Abstract
Two methods based on the variational nodal transport method have been developed to account for localized heterogeneities and local transport effects in full core calculations. A local mesh refinement technique relies on using the projected partial ingoing surface currents produce d during coarse-mesh iterations as boundary conditions for fine-mesh c alculations embedded within the coarse-mesh calculations. The outgoing fine-mesh partial currents are averaged to serve in the coarse-mesh i terations. Then, a mired transport-diffusion method using two levels o f angular approximations for the surface partial currents depending on the node considered has been implemented to account for local transpo rt effects in full core diffusion calculations. These methods have bee n tested for a model of the Superphenix complementary shutdown rods.